2014A&A...565A.120A


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET08:08:15

2014A&A...565A.120A - Astronomy and Astrophysics, volume 565A, 120-120 (2014/5-1)

JKCS 041: a Coma cluster progenitor at z = 1.803.

ANDREON S., NEWMAN A.B., TRINCHIERI G., RAICHOOR A., ELLIS R.S. and TREU T.

Abstract (from CDS):

Using deep two-color near-infrared HST imaging and unbiased grism spectroscopy, we present a detailed study of the z=1.803 JKCS041 cluster. We confirm, for the first time for a high-redshift cluster, a mass of logM≥14.2 in solar units using four different techniques based on the X-ray temperature, the X-ray luminosity, the gas mass, and the cluster richness. JKCS041 is thus a progenitor of a local system like the Coma cluster. Our rich dataset and the abundant population of 14 spectroscopically confirmed red-sequence galaxies allows us to explore the past star formation history of this system in unprecedented detail. Our most interesting result is a prominent red sequence down to stellar masses as low as logM/M=9.8, corresponding to a mass range of 2dex. These quiescent galaxies are concentrated around the cluster center with a core radius of 330 kpc. There are only few blue members and avoid the cluster center. In JKCS041 quenching was therefore largely completed by a look-back time of 10Gyr, and we can constrain the epoch at which this occurred via spectroscopic age-dating of the individual galaxies. Most galaxies were quenched about 1.1Gyr prior to the epoch of observation. The less-massive quiescent galaxies are somewhat younger, corresponding to a decrease in age of 650Myr per mass dex, but the scatter in age at fixed mass is only 380Myr (at logM/M=11). There is no evidence for multiple epochs of star formation across galaxies. The size-mass relation of quiescent galaxies in JKCS041 is consistent with that observed for local clusters within our uncertainties, and we place an upper limit of 0.4dex on size growth at fixed stellar mass (95% confidence). Comparing our data on JKCS041 with 41 clusters at lower redshift, we find that the form of the mass function of red sequence galaxies has hardly evolved in the past 10Gyr, both in terms of its faint-end slope and characteristic mass. Despite observing JKCS041 soon after its quenching and the three-fold expected increase in mass in the next 10Gyr, it is already remarkably similar to present-day clusters.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: individual: JKCS041 - galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: evolution - methods: statistical

Simbad objects: 36

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Number of rows : 36

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO 2744 ClG 00 14 20.03 -30 23 17.8           ~ 546 0
2 ClG 0016+16 ClG 00 18 33.3 +16 26 36           ~ 469 0
3 JKCS 41 ClG 02 26 44.0 -04 41 36           ~ 38 0
4 MCS J0257.1-2325 ClG 02 57 09.151 -23 26 05.83           ~ 47 0
5 RXC J0358.9-2955 ClG 03 58 49.3811 -29 56 04.943           ~ 20 0
6 RXC J0417.5-1154 ClG 04 17 34.6 -11 54 32           ~ 55 0
7 ACO 520 ClG 04 54 19.0 +02 56 49           ~ 374 0
8 MCXC J0547.0-3904 ClG 05 47 01.5 -39 04 28           ~ 26 0
9 PLCKESZ G239.28-25.99 ClG 05 53 27.200 -33 42 53.02           ~ 32 0
10 B3 0714+378 Rad 07 17 36.50 +37 45 23.0           ~ 169 2
11 ClG J0717+3745 ClG 07 17 36.50 +37 45 23.0           ~ 334 0
12 ClG J0744+3927 ClG 07 44 52.5 +39 27 30           ~ 152 0
13 ClG J0848+4453 ClG 08 48 34.800 +44 53 41.90           ~ 121 1
14 ClG J0849+4452 ClG 08 48 56.3 +44 52 16           ~ 102 1
15 ClG J0910+5422 ClG 09 10 44.9 +54 22 09           ~ 85 0
16 RXC J0911.1+1746 ClG 09 11 11.277 +17 46 31.94           ~ 48 0
17 NAME Musket Ball Cluster ClG 09 16 10.9 +29 48 44           ~ 34 0
18 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 448 0
19 ACO 1351 ClG 11 42 30.8 +58 32 20           ~ 62 0
20 MCS J1149.5+2223 ClG 11 49 35.8 +22 23 55           ~ 297 0
21 NAME NGC 4325 Group GrG 12 23 18.2 +10 37 19           ~ 52 0
22 ClG J1226+3332 ClG 12 26 57.7 +33 32 50           ~ 191 0
23 ClG J1252-2927 ClG 12 52 54.4 -29 27 17           ~ 150 0
24 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4132 2
25 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1007 0
26 ACO 1758 ClG 13 32 32.1 +50 30 37           ~ 201 2
27 ClG J1423+2404 ClG 14 23 47.7 +24 04 40           ~ 167 0
28 IDCS J1426.5+3508 ClG 14 26.5 +35 08           ~ 39 0
29 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 39 0
30 ClG 1603+4313 ClG 16 04 23.7 +43 04 52           ~ 126 1
31 ClG 1603+4329 SCG 16 04 31.5 +43 21 17           ~ 35 1
32 ACO 2163 ClG 16 15 34.1 -06 07 26           ~ 514 0
33 ClG J1621+3810 ClG 16 21 25.5 +38 09 43           ~ 66 0
34 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1088 1
35 ClG J2129-0741 ClG 21 29 26.0 -07 41 28           ~ 123 0
36 RXC J2214.9-1400 ClG 22 14 57.3 -14 00 12           ~ 68 0

    Equat.    Gal    SGal    Ecl

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2020.01.27-08:08:15

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